adding really nice explosion (in simple renderer)

game/game_window.hpp

@@ -11,6 +11,7 @@
 #include "state/player.hpp"
 #include "state/planet.hpp"
 #include "state/ship.hpp"
+#include "state/explosion.hpp"
 
 class GameWindow : public endofthejedi::GLWindow {
 private:
@@ -46,6 +47,10 @@ protected:
             drawTrace(trace);
         }
 
+        for (const game::Explosion *explosion : m_game.state()->explosions) {
+            drawExplosion(explosion);
+        }
+
         for (const game::Ship *ship : m_game.state()->ships) {
             drawShip(ship->position);
         }
@@ -78,7 +83,6 @@ protected:
     }
 
     void drawMissile(const glm::vec2 &pos)
-
     {
         glm::vec3 color = glm::vec3(1.0, 1.0, 0.3);
         m_renderer.drawCircle(pos.x, pos.y, 0.01, color.x, color.y, color.z, 6);
@@ -92,6 +96,17 @@ protected:
         }
     }
 
+    void drawExplosion(const game::Explosion *explosion)
+    {
+        // TODO: transparent
+        // TODO: with glow in the middle
+        float r = explosion->maxRadius * (explosion->age / explosion->maxAge);
+
+        // TODO: transparency?
+        glm::vec3 color = glm::vec3(1.0, 0.9, 0.1);
+        m_renderer.drawCircle(explosion->position.x, explosion->position.y, r, color.x, color.y, color.z, 64);
+    }
+
 public:
     GameWindow(unsigned int width, unsigned int height)
         : endofthejedi::GLWindow(width, height) {}

game/state/explosion.hpp

@@ -2,31 +2,32 @@
 
 #include <glm/vec2.hpp>
 
+#include "util.hpp"
+
+#include "missile_hit_type.hpp"
+
 namespace game {
     /**
      * Explosion: just an effect which looks good.
      */
     class Explosion {
     public:
-        enum class Kind {
+        Explosion(const glm::vec2 &pos, Hit hit, float maxAge=1.0)
-            MissileExplodesInSpace, // missile explode in free space
+            : hit(hit)
-            MissileAgainstPlanet,   // explosion of missile when it hits a planet
+            , position(pos)
-            MissileAgainstShip      // bigger explosion: missile hits a ship which explodes with it
+            , age(0.0)
-        };
+            , maxAge(maxAge * (1.0 + 0.1*util::randf_0_1()))
-
+            , maxRadius(0.05)
-        Explosion(const glm::vec2 &pos, Kind kind, float maxAge=1.0)
-            : position(pos), kind(kind), age(0.0), maxAge(maxAge)
         {
         }
 
-        const Kind      kind;     // kind of the explosion
+        const Hit       hit;      // kind of the explosion depends on the hit type
         const glm::vec2 position; // position where it starts
         float           age;      // age (in seconsd) of the explosion
 
         // age (in seconds) when the explosion is not visible
         // anymore and will disappear afterwards
         const float     maxAge;
+        const float     maxRadius; // current radius depends on time.
     };
 }
-
-#endif

game/state/missile.cpp

@@ -49,7 +49,7 @@ namespace game {
             if (dist <= planet->radius) {
                 // TODO: collect all hits and return the first one only
                 // TODO: find exact hit position!
-                return Missile::Event(position, Missile::HitObject::HitPlanet);
+                return Missile::Event(position, Hit::Planet);
             }
 
             dist *= 20.0;
@@ -77,7 +77,7 @@ namespace game {
         // check if distance to center of the universe is getting too big
         float distToCenter = glm::length(position);
         if (distToCenter > state->maxMissileDistance()) {
-            return Missile::Event(position, Missile::HitObject::LeftUniverse);
+            return Missile::Event(position, Hit::BorderOfUniverse);
         }
 
         return Missile::Event(position);

game/state/missile.hpp

@@ -3,6 +3,8 @@
 #include <glm/vec2.hpp>
 #include <glm/vec3.hpp>
 
+#include "missile_hit_type.hpp"
+
 namespace game {
     class State;
     class Ship;
@@ -15,36 +17,29 @@ namespace game {
     // trace then belongs to the player.
     class Missile {
     public:
-        enum class HitObject {
-            Nothing,
-            HitPlayer,
-            HitPlanet,
-            // HitMissile,
-            LeftUniverse
-        };
 
         // missile advances to pos. if hit != Nothing, it hits something and
         // stops existing afterwards.
         class Event {
         public:
-            Event(const glm::vec2 &pos) : Event(pos, HitObject::Nothing)
+            Event(const glm::vec2 &pos) : Event(pos, Hit::Nothing)
             {
             }
 
-            Event(const glm::vec2 &pos, HitObject hit)
+            Event(const glm::vec2 &pos, Hit hit)
-                : hit(hit), pos(pos)
+                : hit(hit), position(pos)
             {
             }
 
             Event(const glm::vec2 &pos, int playerIdKiller, int playerIdVictim)
-                : Event(pos, HitObject::HitPlayer)
+                : Event(pos, Hit::Ship)
             {
                   this->playerIdKiller = playerIdKiller;
                   this->playerIdVictim = playerIdVictim;
             }
 
-            HitObject hit;
+            Hit       hit;
-            glm::vec2 pos;
+            glm::vec2 position;
 
             int playerIdKiller;
             int playerIdVictim;

game/state/missile_hit_type.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+namespace game {
+    /*
+     * A missile can hit different objects the type says which one.
+     * Used in various places so extra file for this.
+     */
+    enum class Hit {
+        Nothing,
+        Ship,
+        Planet,
+
+        // TODO could be needed for really fancy explosions because
+        // this is cool and should noh happen very often
+        // AgainstMissile,
+
+        BorderOfUniverse
+    };
+}

game/state/state.cpp

@@ -6,6 +6,7 @@
 #include <glm/vec3.hpp>
 #include <glm/gtx/norm.hpp>
 
+#include "missile_hit_type.hpp"
 #include "object.hpp"
 #include "missile.hpp"
 #include "player.hpp"
@@ -13,6 +14,7 @@
 #include "ship.hpp"
 #include "commands.hpp"
 #include "trace.hpp"
+#include "explosion.hpp"
 
 #include "util.hpp"
 
@@ -162,26 +164,25 @@ namespace game {
                 //std::cout<<"missile: " << (long unsigned int) missile << std::endl;
                 const Missile::Event evt = missile->advance(this, dt);
 
-                missile->trace->addPointFromMissile();
+                const bool isHit = (evt.hit != Hit::Nothing);
 
-                // TODO:
+                missile->trace->addPointFromMissile(isHit); // force point if missile gets destroyed a
-                // spawn just if the path differs
 
-                if (evt.hit == Missile::HitObject::Nothing) {
+                if (!isHit) {
                     i++;
 
                 } else {
                     switch(evt.hit) {
-                        case Missile::HitObject::HitPlanet:
+                        case Hit::Planet:
                             //std::cout<<"hit Planet" << std::endl;
                             break;
 
-                        case Missile::HitObject::HitPlayer:
+                        case Hit::Ship:
                             //std::cout<<"hit Player" << std::endl;
                             playerKillsPlayer(playerForId(evt.playerIdKiller), playerForId(evt.playerIdVictim));
                             break;
 
-                        case Missile::HitObject::LeftUniverse:
+                        case Hit::BorderOfUniverse:
                             //std::cout<<"missile left the universe." << std::endl;
                             break;
 
@@ -189,6 +190,8 @@ namespace game {
                             break;
                     }
 
+                    addExplosionFromHit(&evt);
+
                     player->missiles.erase(player->missiles.begin() + i);
                     delete(missile);
                     //std::cout<<std::endl;
@@ -200,16 +203,32 @@ namespace game {
         }
     }
 
+    void State::advanceExplosions(float dt)
+    {
+        size_t i=0;
+        while(i < explosions.size()) {
+            Explosion *explosion = explosions[i];
+            explosion->age += dt;
+            if (explosion->age >= explosion->maxAge) {
+                delete(explosion);
+                explosions.erase(explosions.begin()+i);
+                continue;
+            }
+
+            i++;
+        }
+    }
+
     void State::advance(float dt)
     {
-        //std::cout<<"advance ship spawns" << std::endl;
         advancePlayerShipSpawns(dt);
 
-        //std::cout<<"advance commands" << std::endl;
+        advanceExplosions(dt);
+
         advancePlayerCommands(dt);
 
-        //std::cout<<"advance missiles" << std::endl;
         advancePlayerMissiles(dt);
+
     }
 
     Player *State::playerForId(int playerId)
@@ -270,4 +289,13 @@ namespace game {
     {
         traces.push_back(trace);
     }
+
+    void State::addExplosionFromHit(const Missile::Event *evt)
+    {
+        if (evt->hit == Hit::Nothing || evt->hit == Hit::BorderOfUniverse) {
+            return;
+        }
+
+        explosions.push_back(new Explosion(evt->position, evt->hit));
+    }
 }

game/state/state.hpp

@@ -7,14 +7,16 @@
 
 #include <glm/vec2.hpp>
 
+#include "missile.hpp"
+
 namespace game {
     // forward declarations
     class Command;
-    class Missile;
     class Player;
     class Planet;
     class Ship;
     class Trace;
+    class Explosion;
 
     class State {
     public:
@@ -61,10 +63,11 @@ namespace game {
 
         // Game items which should be rendered are here:
         // (access missiles by iterating over player's missiles attribute)
-        std::vector<Planet*>  planets;
+        std::vector<Planet*>    planets;
-        std::vector<Ship*>    ships;
+        std::vector<Ship*>      ships;
-        std::vector<Player*>  players;
+        std::vector<Player*>    players;
-        std::vector<Trace*>   traces;
+        std::vector<Trace*>     traces;
+        std::vector<Explosion*> explosions;
 
     private:
         /*************************************************************************/
@@ -73,6 +76,9 @@ namespace game {
 
         void playerKillsPlayer(Player *killer, Player *victim);
 
+        void addExplosionFromHit(const Missile::Event *evt);
+
+        void advanceExplosions(float dt);
         void advancePlayerShipSpawns(float dt);
         void advancePlayerCommands(float dt);
         void advancePlayerMissiles(float dt);